伊人久久大香线蕉综合AV_亚洲好穴_WWW激情内射在线看_亚洲色网址_欧美日韩成人一区_国产吃奶摸下激烈视频无遮挡

Welcome to Aigre?

more>>Industry Overview

News

The Origin of Railway Gauge Standards
addtime:2022-04-12click:317


The history of railway gauge can be traced back to the coal mine transportation era in the UK, where the track spacing was set at four feet eight and a half inches (1435mm), which later became the standard gauge for railway systems worldwide. In 1825, Stephenson, the inventor of the steam locomotive, adopted this gauge, and with the spread of railway technology, this standard gradually gained adoption in the United States, Germany, and other regions.

China's railway construction began in the 1880s, when foreign powers exported railway technology and products to China through loans, bringing various technical standards with them. Therefore, China's railway gauge system initially showed diverse characteristics, with British, French, Russian, and other standards coexisting. This chaotic state of gauge systems persisted for nearly a century until the late Qing Dynasty, when there was a gradual move towards unification.

During the process of unifying the gauge system, the influence of the UK was the most significant. Since most of China's earliest railways were built or assisted by the British, the British gauge was widely used in China. However, some railways also adopted standards from other countries, such as the French standard for the Lu-Han Railway and the Russian standard for the Eastern Qing Railway.

To address this issue, the Chinese government and relevant authorities began to carry out gauge system reforms. They gradually unified the national railway gauge system by formulating relevant regulations and standards. Ultimately, the standard with a British gauge of four feet eight and a half inches, Martin steel as the material, and a mainline track weight of 85 pounds was established as the standard for China's railways. This standard not only applies to railway mainlines but has also been gradually extended to other railway lines.

Since then, China's railway gauge standard has been followed to this day and continues to develop and improve. The establishment of this standard has not only improved the operational efficiency and safety of China's railways but also laid a solid foundation for the modernization of China's railway development.


主站蜘蛛池模板: 精品少妇人妻AV无码久久 | 中日韩产精品1卡二卡三卡 久久五月激情 | 亚洲字幕成人中文在线观看 | 国产精品爆乳奶水无码视频 | 欧美爆乳乱妇高清免费 | 日韩精品1| 国产乱配视频免费观看 | 国产产无码乱码精品久久鸭 | 亚洲精品乱码久久久久久金桔影视 | 日韩精品亚洲一区二区三区免费 | 国产日本在线播放 | 久久精品99国产精 | 国产日韩欧美久久久精品图片 | 免费在线观看黄色片 | 中文字幕一区二区三区乱码图片 | aaaa大片| 伊人久久大香线蕉aⅴ色 | 久久九九国产视频 | 国产大片在线看 | 亚洲av丰满熟妇在线播放 | 国产视频欧美视频 | 与丰满少妇做爽视频 | 久草免费精品视频 | 亚洲爱爱综合 | 穿书自救指南2樱花动漫免费观看 | 亚洲精品无码AAAAA爱的色放 | 国产欧美a| 国产亚洲v | 成人美女免费网站视频 | 欧美人与动性XXXXX杂性 | 久久高清视频免费 | 护士脱了内裤让我爽了一夜视频 | 特级淫片aaaaaaa级 | 成人久久久久久久久久久 | 亚洲中文日文韩文 | 亚洲国产天堂久久国产91 | 老司机在线精品视频播放 | 成人午夜在线 | 好爽进去了视频在线观看国版 | 综合av第一页 | av黄色片 |